I was too careless, didn't take note of battery polarity & plug in Turnigy nano Lipo into Mini CP.
Too late when I saw smoke came off from the Main receiver board.
Aileron servo won't move & main motor won't spin, but still have control over tail, elevator & pitch servo.
Anyone know how to repair the main receiver board?
Cost $60 for main board, rather order ARF MiniCP set if can't repair.

Sorry for your loss Usually reverse polarity = TRASH because it usually fries every semiconductor on the circuit board. If your lucky the servos may have survived but maybe not.

Think of the bright side: You probably did it without smoking the pot, or having to roll a new coil, so those two parts are probably still as good as new, and can still be used by someone? If you don't want them, I'll gladly take them off your hands.

Also, it might be possible to turn the negative mishap into a positive "lesson":

In most electrical cases, it's probably NEVER a good idea to connect a RED wire to a BLACK wire, or vice versa.

There might be a reason why people all over the world are in the habit of choosing the colors RED (color of blood) and BLACK (color of death) to signify potentially dangerous situations?

Think of the bright side: You probably did it without smoking the pot, or having to roll a new coil, so those two parts are probably still as good as new, and can still be used by someone? If you don't want them, I'll gladly take them off your hands.

Also, it might be possible to turn the negative mishap into a positive "lesson":

In most electrical cases, it's probably NEVER a good idea to connect a RED wire to a BLACK wire, or vice versa.

There might be a reason why people all over the world are in the habit of choosing the colors RED (color of blood) and BLACK (color of death) to signify potentially dangerous situations?

I had read before about the polarity being backward on those batteries. I received my walkera style battery connectors from ebay and they were all backward. Easy fix but it still needs to be noted.

3d flyer. It is either your settings in your radio or its a bad tail motor, broken or frayed wire going to your tail motor , or the tail boom has worked its way out of the fuse. most likely. Go through all of your settings. Also make sure your wires are not crimped/bent anywhere. Push your tail boom in all the way, make sure there is no cracks to let it bend. Try spinning the tail blade while the motor is off, it should spin. Smell it, burnt? Check all the wires. What have you done differently? Check all your switches to make sure they are in the right places.

I had read before about the polarity being backward on those batteries. I received my walkera style battery connectors from ebay and they were all backward. Easy fix but it still needs to be noted.

...

I think smoking the pot is one thing, but burning down the house is another:

Quote:

Originally Posted by Z06 Tony

Just went to charge my Turnigy Nano-Tech 1s 750mAh LiPo that I am gonna use for my V120D02S and my breaker tripped so tried twice to reset and just tripped right away. Went and checked the batt and the charger was super hot and melting. I checked the batt and the polarity is reversed. My DUMB move for not thinking to check. Maybe if I plugged it in the heli 1st I would have noticed cus the wires would have been a diff color but the charger wires are Black. If you buy these LiPos for your Walkera helis just pull out the wires and reverse. I know Losi uses these connectors and they are reverse from Walkera(Dont ask how I know)

***The point of this post is NOT to say that HK wired the batts wrong as I know they are not. Just that they are wired opposite of Walkera batts/charger***

Pulled off my first flip to inverted hover today. But at full negative I didn't have enough pitch to maintain altitude. I'm running 50% pitch t/a to keep the tail from blowing out. Maybe my c05m is a freak and is better than you all's or I have something seriously wrong somewhere. I think it's time to order a 4g3 7mm tail motor so I can up the pitch t/a again.

Pulled off my first flip to inverted hover today. But at full negative I didn't have enough pitch to maintain altitude. I'm running 50% pitch t/a to keep the tail from blowing out. Maybe my c05m is a freak and is better than you all's or I have something seriously wrong somewhere. I think it's time to order a 4g3 7mm tail motor so I can up the pitch t/a again.

I haven't inverted for real yet, so I don't have much "weight" behind my talk; however, I imagine there shouldn't be any difference in the heli's ability to hover whether straight-up or inverted.

Since the heli weighs exactly the same in either direction, I'd expect it would need the exact same amount of "lift"/thrust in either direction.

I think lift/thrust is related to Main Blade Pitch * Main Blade RPM.

If so, then what ever the heli needs straight up, a simple solution for inverted would be to keep same rpm, but exactly opposite degree Main Blade Pitch.

If so, having the problem you described, assuming the same rpm or more is available inverted, then I'd suspect MIN/MAX Main Blade Pitch is NOT equally centered?

If so, the reason may be because too much up-and-down slop between Main Shaft Collar and Main Gear? If so, first make certain Main Gear is fully pressed and properly seated on the Main Shaft, then while pressing upward on the Main Gear and firmly pressing downward the Main Shaft Collar to remove any slop, tighten the Collar screw.

If those are nice and tight, then I'd use Throttle Hold and measure MIN and MAX Main Blade Pitch angles, and adjust Links as required to make the MIN and MAX Main Blade Pitch angles equal.

Just a guess from someone that has not yet turned a Link on a CP before, so YVMV.

Pulled off my first flip to inverted hover today. But at full negative I didn't have enough pitch to maintain altitude. I'm running 50% pitch t/a to keep the tail from blowing out. Maybe my c05m is a freak and is better than you all's or I have something seriously wrong somewhere. I think it's time to order a 4g3 7mm tail motor so I can up the pitch t/a again.

I would increase your pitch T/A back to at least 70%. Some people set their pitch to as much as +- 20 degrees on larger helis. There is much less possibility of tail blowing outs on Walkera 100 CPs than the MCPx. Moreover, going brushless will prevent it further as it draws current directly from the battery rather than going through the board.

New to this thread and wanting to get a mini cp. Question. How is mini compared to the genius? All the info I have been getting is that the mini is more stable than the genius by a factor, but I rather hear it from the horse's mouth.

It's way more stable than both of my Genius's were. I'm actually doing most of they flying now instead of reacting to what the helicopter is doing. I gave one of them to a friend and I'm converting what I can into a second MiniCP.

ITSMILLERTIME As far as pitch amounts im running 60 in pitch travel adjust and 100 in pitch curves and heli flips fine with the same set up .Also travel adjust is at 90 for both elev and ale control . As you do more flips you will find that your collective use will get better and your tail will not blow out .

I'm not sure if anyone has tried this motor, but I picked one up for a V100D03. It looks like a smaller version of what is in my V120D02s. It fits into the MiniCP, but the pinion will not mesh with the main gear. I ordered a 9 and 10 tooth pinions to see how it works. I also got the speed control for the V100D03 as well. If it works, I'll let you know.